Rotary tool for beading-over cylindrical flanges



July 20, 1948. T. c. KoRsMo 2,445,357

ROTARY TOOL FOR BEADINGOVER CYLINDRICAL FLANGES Filed May 12, 1947 (q K/ v Zhwentor 6 \23 22 Tot-b3 orn Conrad Korsmo Qttornegs Patented July 20, 1948 rl- 'CYLINDRICAL FLANGE S Torbjorn O. Korsmo, Madison, wis., assi gnor to Madison-Kipp Corporation, Madison, Wis., a

corporation of Wisconsin" U Application May 12, 1947, Serial No. 747,413

This invention relates to tools and particularly to tools for beading-over cylindrical flanges or tube ends by a sort of spinning operation.

The invention was developed for use in locking a threaded fitting into a seat formed in the wall of an oil drum or like receptacle and will be described as so applied. but without implying any necessary limitation to this field of use.

In its preferred form, the tool is carried by a shank intended to be engaged and turned by a rotary socket or chuck. At the lower end of the tool stock is a head on which are pivoted a plurality of similar, notched, work-engaging spinnin formers. These formers are symmetrically arrangedlabout the axis of the tool stock and swing through a small arc in radial planes relatively thereto. The notch in the former determines the final contour of the bead. At the beginning of the spinning operation the flange to be beaded-over engages in the notches in the formers in such a way that when the shank of the tool is forced toward the work, a rotary tendency is imparted to the formers, which consequently swing inward. This motion is resisted by a coil compression spring which encircles a portion of the shank and reacts on a collar slidable on the shank. This collar engages arms fixed to the formers.

Thus, when the rotating tool is moved against the work, the former notches engage the edge of the flange. The first reaction rotates the formers slightly inward on their axes against the resistance of the spring, so that the spring develops a reaction which curls the flange outward. From then on the spring reaction causes the formers to follow the work and wipe the flange down into a semi-circular bead.

The invention will now be described with reference to the accompanying drawings, in which Figure 1 is a side elevation of the tool with a portion of the end of the shank broken away. The position of the work piece at the moment 01' initial engagement is indicated in dotted lines.

Fame 2 is a view looking upward at the end of the tool shown in Figure 1.

Figure 3 is an exploded perspective view of the former with its related arm.

Figures 4 to '7 inclusive show how a typical fltting is mounted in a plate having a seat formed to receive it. The outline of one former is indicated. The views are axial sections through the fitting and the figures show successive stages in the beading operation from the initiation of the beading-over operation to completion of the bead.

Referring to Figures 1 and 2, the shank of the 1 Claim. (01. res- 80).

. 2 i toolhasv an ordinary Morse taper I I whichis intended to be received in and rotated by a conventional socket or chuck. Below the tapered portion, II the shank has a cylindricalportion I2 which terminates in a spider or head 13 whose form isclearly shown in Figure 2.

In this connection it may be remarked that the headl3 here illustrated is of a type intended to carry three symmetrically arranged formers. Three is a convenient number; two could be used; a larger number than three is possible but not needed and not ordinarily desirable.

Slidable on the portion I2 of the tool stock is a collar having a flange l4 and a hub l5. In the positionshown in Figure 1 the hub l5 engages the top surface of the head 13 and is urged against that surface by a coil compression spring [6. The spring 16 is sustained under moderate compression by a collar H, which is clamped to the tool stock by set screw I 8.

The head I3 is designed to carry three formers and consequently takes the form of a three-armed spider in which each of the arms 2| is laterally offset from the radial plane so as to afford clearance for the former disc indicated at 22. Each such disc 22 is formed integrally with a stem 23 which turns in a bearing or bore formed in the extremity of the corresponding arm 2| (see Fig. 2). The stem 23 carries at the end remote from the disc 22 an arm 24, which has an offset lug 25 designed to engage a stop screw 26 threaded into a portion of the head l3. The arm 24 is fixed on the shaft 23 by a key 21 and a staking pin 28 (see Fig. 1).

In the normal position of the tool when not in use, the lugs 24 engage the stop screws 26 and the lower side of the flange M of the shflilig collar. Each of the discs 22 has a forming notch 29 which is the active portion of the tool intended to engage the work piece. This notch ultimately serves as a forming tool for the completed bead.

The tool forming the subject matter of the present invention has now been described, but before describing its use, it is desirable to describe one form of work piece upon which it is intended to operate.

In Figures 4 to '7, A represents a portion 01 the shell of a sheet metal container, such as an oil drum. The shell is offset at B and flanged at C to receive and closely embrace a die-cast fitting comprising a bushing D with an internally threaded bore E, hexagonal flange F and a deformable cylindrical outward extending flange G which is the flange to be beaded by the tool here described. The bushing D is put in place in the NT OFFICE i 3 seat formed in the plate A, a gasket H being placed as shown. During the beading operation, the bushing D is sustained by a support not indicated in the drawings and of conventional form.

Assume now that the bushing and the container wall are assembled, as shown in Figure 4, and the tool stock, while being rotated, is lowered to the position indicated in Figure l, in which the terminal portion of the flange G engages the notch 29 in each of the discs 22.

Referring to the left hand disc in Figure 1, the point of engagement is between the axis of the tool stock and the axis of the stem 23 on which the tool disc 22 is carried. Consequently the particular disc 22 just mentioned tends to turn counterclockwise as viewed in Figure 1 so that its arm 24 tends to force the flange [4 upward against the resistance of the spring 16.

Similar reactions occur as to each of the discs. In Figure 4, one of the discs 22 is outlined and an arrow indicates the direction of its reaction under the urge of the spring 16. As a consequence of this reaction, the flange G quickly assumes the outwardly flared form shown in Figure 5, then the curled form shown in Figure 6 and finally becomes the tight bead indicated in Figure '7, the bead being spun over and caused to engage closely the margin of the flange C. Since the bushing D is rigidly supported, the gasket H is held in compression and the bead when completed maintains tight engagement.

A close comparison of the outline of the disc 22, as diagrammed in Figures 4 to 7 inclusive, will make clear the fact that on first engagement the beading discs turn against spring resistance, and that in the ensuing operation the spring turns the discs back to their initial position in such a way that they follow up the fianging and bead forming operations closely.

What is claimed is:

A rotary tool for beading-over an upstanding cylindrical flange, said tool comprising a head adapted to be rotated about an axis and to be fed in the direction of said axis toward a coaxial, flanged work piece; a plurality of similar notched, work-engaging members j-ournaled symmetrically on said head to turn thereon in planes substantially radial to said axis; a collar mounted behind the head and guided to shift in the direction of said axis; a spring biasing said collar toward the head; arms, one fixed on each workengaging member and engaged by said collar, whereby the spring, reacting through the collar similarly biases all the work-engaging means; and stop means serving to limit the motion of said members under said bias, the parts being so arranged that when the rotating head is shifted to cause the flange of the work piece to engage in the notches in said members, the members are first turned in one direction against the reaction of the spring and then reverse their motion and respond to the spring bi-as'to follow the flange as it is spun into a bead.

TORB'JORN C. KO-RSMO.

REFERENCES CITED The following references are of record in the file of this patent: 

